After a bit of research i found a device in which you can use the door latches hole.
How to create a lock for your door.
The fork will be used as the lock itself although this diy project does require you to get your hands dirty at least for a little bit.
It will not unlock if you turn it from the outside.
A redstone lock that you can use to reject or accept people at your door.
While a door barricade might allow someone to open the door slightly the door bull is more of a lock.
To unlock the door simply turn the knob from the inside.
You should see a small cylindrical button protruding from the center of the knob.
Make an iron door and two pressure plates.
Keep a second pressure plate in your inventory for now.
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Place a single iron door wherever you need your entrance.
Turn the knob to make sure that the door is locked.
Craft an iron door with a tall 2 x 3 pattern of iron ingots.
This should lock the door.
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And if anyone tries to forcefully break in the bull will make the door a more difficult opponent as it distributes the force more evenly between the door and the door frame.
If your knob has a push lock.
I needed to lock a toilet door from the inside the other day and there was no lock.
Not being able to wait for shipping i improvised using a bit of kitchen hardware.
Lock a door without a lock.
There s two different designs in this video.
It keeps the door fully closed.
Place a pressure plate on the external side of the door but not near enough to activate it.
It s the perfect method to quickly modify a door and make it more difficult for intruders to come in.